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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0fbc801c8bb50e598a079ae3010b9fd93bcdbddbf09695e22de1c29bef2aa58' 
  AND token = 'LNM7Qj8/86fYTbetDxA/HSWRO7peKg8mOPNArq6GOa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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