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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b686612e4012a7c9b59e4c340e479928e3930d06c0f511a69144ebbcc83bfd53' 
  AND token = 'giw8AHcnjOxpu9pWhajlYXSF/VTHh7HeYhPDaCQAqHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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