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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61de88bc6b763b1d8ba40275230187668b10a7a8c7b59c904cf0f7e2cf04c746' 
  AND token = 'sbXweznxjskSkB88xMup7yQfukXaKqZf2J1HdjNqSgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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