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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc09ec0ae73f874df7f2d8d13e76166a5e518cacedbfd833b73a7825d9d8894' 
  AND token = 'SSGkCrZwzq2cPGh4Ci8azsnl6XmbGHoH4b/5aRgh0rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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