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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41da33eb74cdc11d165c58e41a38506131991fe295f68efa7fd103a2c4011363' 
  AND token = 'kJ3zcVuo2RSgOkGl0oJM8xIaBjs/q7QjCiL/1Pm6rls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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