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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab69de7c67b7c77986504bec256adac0d4ac1cfd81c49b79daf513924c89dffd' 
  AND token = 'bMY0szhL7AaOnB+kXC5NRh695yrbXgSVMNKizS20Crs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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