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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2aaf1e03de4d9386a68dbf7ee838b9b0e6d797ac341ca12cedde1404a116eda' 
  AND token = 't0vW/lPzTbzVYaoAwI86DUIU8V9NBv43WG8Ba3Om2Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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