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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd8a013152d093ae6d956975913c6fe8b5414a891f5e9499773cfd269439c92' 
  AND token = 'k3Snsayj3US3E3BdqY6vHfeEpRaJbWiYy825uYM4X+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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