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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f81b851a73d9f66cd98e072eb4ef76cb93c0853128f9eda144c9ca59c19c4d' 
  AND token = 'rvreQMb7Boys0eGhxsxEjHEWRngO16Oy1e6AoyXQ+8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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