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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f5d4b9b2c243c490c2e9b569f5fd13592ce274ee093fcc05b3b708e7f64ac0c' 
  AND token = '9cRcEEtQgXHh87VKR5LgWRa+YRTMFSVEGVJd6NBGHZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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