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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5b4d507111cdb70e738f1a63319955ad1101fc1527f984077bbadf56c003da' 
  AND token = 'FYAO4Gz9oiUMCz4x2WNlwlMu5q6Tv6puNtj/7nH1K1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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