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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c0061adca17361b4e8151061fa7a233d94d594d572fffe8fe949c0bc51356ac' 
  AND token = 'pJ+e3thf/PkdFRcBcf0AjkWpbmpS0s1SFi01Zgx0q9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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