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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26f4ea79091622c847ea9fa80f4376dd8dc692ab59a38c6a47f9359b014623a' 
  AND token = 'XlCT6MH8bw63mgtTnQ9oejnj6OLt4y9nOys8OkKH8WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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