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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f0cf37dd9d4a7b34b96817df80e1868a56e6fcea19dac91abf9eadc9653632' 
  AND token = 'R5rY53vWX5dMcUA2acus3nRQ2h/++6gBhrzVKwWCyBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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