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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '328e96740aa53237549cf0149772de2b26c39163879b864a2770eb5a4587bc3b' 
  AND token = 'NtGp+U4lgv6tEG5wtyFE7yBPWRQ2wQwcXkA+x7VPNY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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