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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb99510206f07ce47dfb32ec118ca4e33db73dae5315a5b3af1abc8ab7bb115' 
  AND token = 'u1YCnd4xEnT/ndZSf5SMpQnWupt8nHAzwdXSojD39xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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