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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb2815cedb2c8b76e10875b571cfca21c3cb12b14fdfb1ce92e4fedc9d13e8f' 
  AND token = 'OXtrCi/ow0mB9xIgL53gECSe5MzWV7wHTqrN0YBLYgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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