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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a764379fec664e3b5dbb643a3211baa2929dab01d7825d6c3025b72e730dbc42' 
  AND token = 'H7LQ7WV8tx3ivO9BsF2dyydASbQfO5zHw43Ef8e6Axw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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