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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c5ab15064856949c5c482fada2f8a3f92dc9d74c160e1a8529f1c41c1c628a' 
  AND token = '9m4ASyK0Pp7A+NzBP1IaM0S5i0lroFy18k0OzcRvGgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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