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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'defa5d1250ec0c368ca941acc09472c37df68ecf17fccd770358b391c6089fe3' 
  AND token = '7hJw2H374fN8KfuSs3fg/fagUxtTUiBz3eXHdBL5czE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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