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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724df08a20d733141d0c21ab23f6d77f1b984ee2da3c9f5c8d57c1bccf0c3332' 
  AND token = '7y9ysEe1se0hGztplusrYlT+4EJl7CQop8L72fzyP94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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