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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9cdec902a1b01788a702fb00da5305e204a1175317961e221c7064be58923de' 
  AND token = 'LyMOO1H0fqHv4vZkXlZ2D7TxFWALFuC7jCpTuq4hDy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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