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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9960e1a6e2d5dd67d7b74d3f66f641d1bed2f81c9d9ccb41ac1d84a36c3806' 
  AND token = '3jP75qub7EFjQQEkJzKYOPpp6BUNlK21BOQj+NwndNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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