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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2b244a7b554056b13d033e3ff7d915964d690cb2e44f54320416d46691c9a4' 
  AND token = 'tmV6eIASDngkiGVBSbnH5kyl9Q122pdYtjM+ozZURUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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