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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05212042b8eb67c276ec1bca164410c6832e7425ff7aac272287a0fd0788a1a' 
  AND token = 'eTWli8VFoK26MpJ/ZxZiaBVoxlj6q2zge3BhWC2FYSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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