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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c9a554ad77eda781e7a719a607b2c772aacec8d03c1a72934d96f8baf0fc55' 
  AND token = 'XjFjzuGOVCiuIidXrTSWdKDEiv34owb4xucvBJszE3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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