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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61cb0bdec8907f91ea0cd5ff6d5c41042de5f543cbec535eff9c278b5bd60e7c' 
  AND token = 'LrPf/U4mOnItwjZlrDhDebH+7fFd+jNjv1JtpAy1iFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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