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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ddeb9490b2d45076d2f6e2c7f9e28e164d43baa0ec74813b8f3c10a777bd902' 
  AND token = 'PrFu5RyFBicR+RCmuWLY/CXu28WcA0Q368wY9dprPVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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