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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ab0ad129338fdefa634b3881de959b81959643bde42eac6ab20aa1ce7f1ce4' 
  AND token = 'gnFzQ95AiV00Aq8s2BWYJxzkba2XSnd2ucje2XR8baU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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