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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c97441949a1f244db1ba7dce9b7b45b85ff9d4cd4b70c91fa31f4e7fd3d78c' 
  AND token = '5FY9K69PM153o8a0ltP9ksLb1clQj6RdU9U2F/3c4jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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