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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31ac12a310373a7f926fafbbfa6c1d5360d071c21b1dd41abd5abf03a3fdbfc' 
  AND token = 'e2/CJjTtnUyLVyP7sGP0m86A2sdYN6sTqETKKo8Or5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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