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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8126b111f57b029792d5ce8657ce76f0f3e54f04be58da0094f02143f12a36b' 
  AND token = 'hLHvW61Sw80Qu1qZtawXsZTiMue9Kg2SMv0D0l74RVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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