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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5e331ea21120601ef808ecf87c54be34f94ce4db97a0d86bf68e631142cdba' 
  AND token = 'qWUkeIOjZ5EW3ydsuWmGQ8JiWkGkUn13vK2ThPaplpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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