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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98d5167de63d13cff48d980491b6827dee93613e6db9f053f7b7033205ded39' 
  AND token = 'wM2eC5QqwmNQmtInDDruqPO/hT6jHIsgApqrzL9IcMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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