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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65a11c4a0186f1ef3c26087378a86ea219a6177f3ecba00e1ce05f25423507c' 
  AND token = 'trMhEueQRy9/TO71ArqMbqLSaCEeK5tQU1RxyvGhg/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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