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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '612cf66b322d7ee32a0b304af1234feb0ce2376a8ee820920cd2831075519761' 
  AND token = '6tn3qQrn7i3bYSn9XQbUG0G6cYDoxkgJuW22HunSonQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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