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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ee7e2d19ba10179a2b7248e510b6735517d08cd52fce85d38f0775210a8540' 
  AND token = 'SjhE7241lkBsykfQVDSN5UZLWKXx7yW2bjI73veMspc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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