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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae37e29fd1d8f296b2f1ced9d606b509699ce1b64d8448178dcfb87f6a5ef6a0' 
  AND token = 'u40o7zmTGm9JjQ7CME9H2UhuerikY08GBQegCcYxm8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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