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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a99e52316c20406b17f8558ac90b9e43cd1f919df3d0b2e303ef43688921f00' 
  AND token = 'NMvpVJgmuNJRjIyqsEfOtx5+qfobAWjGgdWqeojPxj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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