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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0030f415d35c0de9083c1ec73111ee64b6ba6974fe98b4f3a73c5226782bb72a' 
  AND token = 'WCHlXUKtk1oDk+N5NOSNdAScR5QGAZWKv8/1/ErljPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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