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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeaa27f101f2adbd4e5dcaad6c4b7f6f93bd0e1ac25c71447fd084c90ef57694' 
  AND token = 'eHR3F6YUJCp9nm1fCMzxPyGHQ3TlkGyZ0tp++kB2tYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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