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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe1d03dc9a8658213d18d50b2ee270d766899a0b113864087c46b90425e728c' 
  AND token = 'kZ0z4076xdh6Cr3t9K/fUEDLMyeVK0ZwRAIvq2NQ3J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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