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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b657342c633ea107597673d4a82b68e5f5f50c93fa8f6c40b054ccf25fec411c' 
  AND token = 'xMYEjcrVE0I+JLlb5sqSm/45wIJGAWFJ6tLBx6AxN24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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