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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8812a13b11089b1d5cc8856d0573d9bff58e32cfeb267846ba6c9c4ad7e52ea3' 
  AND token = 'LDdoK3MVNOcRxPuM51MOF0OzFbLgxpve4uRo3C12A5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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