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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90d798dbb3bc57a84df1de588b2bf030becb04e7815d9a9ad383ef7f61e61b7' 
  AND token = 'u0W+sDW6NNmj7Brrun2T/nMP0zMSHJcF+nqQFsNoPe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}