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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fae7a31b32c5f5ac5d899d8c8e8094dd70545b838dd497945c851a047af141d' 
  AND token = 'jOmQt+HhONBVYHszZZqdQZmT/sRu24588B/6DmSnhH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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