Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c286c91d9999439f0d182e1698a09f3ccf697f54f691d743fc7c1cd50936d5' 
  AND token = '5JiudTx8y4NvVqUqzJJoslwAz+QAClX+zTZLCNtd1j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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