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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33ff2cba9abb5edb1a19dc3b6a53c98dcd47de16a153cc95ea9a6495ab7561f9' 
  AND token = 'rZAZjV3XgxJZxj2HXUhZai0LqOOr259ZAWZ3knpqfhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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