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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd38535989f73d5d4664984e5e46779619f0c4560d31beb2c875d8a91475ddc2d' 
  AND token = '3eVyw4lXFkHz50wRcpp9RZg7mW+S2PNNvJr1NR33iE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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