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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f3dfdcbf5d8a089169c9ec8dfae1fb3d392eb012ae1ab383e473779ac13dea' 
  AND token = 'i1Fz7BG9cp0H5YsNsMUTGRQPcsvkfHNuoFKit0pE7PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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