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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab7c43cab8c1dcec580414a40731e4909e634d9482049a813d73beaa134a0bf' 
  AND token = 'O0uBygEVnpU5HGp9iaa0YNcBVO1J7zCDNZrFIJldIQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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