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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a383eb9b52ca3b4914557e2d938642b0d05153610c840e8b9b207923f6f352' 
  AND token = 'i8Ip9VaK9zeTGXx3aq9VZxaypdzsr9DJfZ7TAXtULS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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