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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e6ba7d78a6b8f0530fe629f940778662aa6dd6a685ccb59542e8887810076ef' 
  AND token = 'zhreU33pGmLsCjA914ppufm0M3fsRowpDE6oalPb5bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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